Article Dans Une Revue Advances in Natural and Technological Hazards Research Année : 2012

Failure Processes and Gravity-Flow Transformation Revealed by High-Resolution AUV Swath Bathymetry on the Nice Continental Slope (Ligurian Sea)

Sebastien Migeon
  • Fonction : Auteur
Antonio Cattaneo
Virginie Hassoun
  • Fonction : Auteur
Alexandre Dano
Aurelie Casedevant
  • Fonction : Auteur
Etienne Ruellan
  • Fonction : Auteur

Résumé

The continental slope offshore Nice is a natural laboratory to investigate submarine landslides and gravity-flow processes. Using EM300 bathymetry data (spatial resolution of 25 m), about 250 scars with volume less than 8 x 10(8) m(3) were identified. The AUV bathymetric data (spatial resolution of 2 m) revealed a greater number of scar-related failures with two main morphologies: some scars are affected by retrogressive processes of erosion, suggesting failures were triggered a long time ago, while other scars exhibit no evidence of post-failure erosion, suggesting they could have been triggered recently. Downslope from the scars, there are scattered blocks, on average 5-m high and 40-m wide, and well-developed asymmetrical waves, on average 2-m high and 20-m in wavelength. Such evolution could be evidence for the transformation of the remobilized deposits into cohesive flows then turbulent flows. Such transformation took place over a distance of less than 6-8 km.

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Dates et versions

hal-04499333 , version 1 (11-03-2024)

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Sebastien Migeon, Antonio Cattaneo, Virginie Hassoun, Alexandre Dano, Aurelie Casedevant, et al.. Failure Processes and Gravity-Flow Transformation Revealed by High-Resolution AUV Swath Bathymetry on the Nice Continental Slope (Ligurian Sea). Advances in Natural and Technological Hazards Research, 2012, 31, pp.451-461. ⟨10.1007/978-94-007-2162-3_40⟩. ⟨hal-04499333⟩
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